Watermark on Desktop back again: Windows 10 Insider Preview Build 15048

In Windows 10 Insider Preview Build 15042 there was no watermark present on the Desktop. And there was no expiration date either.

Bad thing -it has again come back in Windows 10 Insider Preview Build 15048. And the expiration  date for this preview build is 16th May,2017.

I am still trying to understand why did the watermark  and expiration date vanish in earlier build and what made them reappear in Windows 10 Preview Build 15048.

I have no clues 😦